'use strict';

function get_union(collection_a, collection_b) {
  
  let arr=[];
  for(let num_a of collection_a)
    arr.push(num_a);
  for(let num_b of collection_b)
    if(!arr.includes(num_b))
      arr.push(num_b);
  return arr;
}

module.exports = get_union;

